students in shanghai, china, scored the highest in math, reading, and science. american teens did not make the top 20. so we were surprised today to learn that the chinese are going to try something revolutionary. they're cutting back on home work. we asked seth doane to find out why. >> reporter: who's happy about not having home work? the reaction from these second graders was not surprising. a resounding show of support. the proposed changes means students in grades one through three would not be assigned home work. those in grades four through six would have less than an hour of home work a day. liu xiaojing teaches kindergarten in beijing's elementary school. "not giving home work leads more space for kids to grow" she told us. "students can develop freely and do what they enjoy doing." >> we can read books. >> reporter: ten-year-old daisey told us she might dance or draw. while 12-year-old charlie had something else in mind. >> playing football or playing basketball with my classmates. >> reporter: china puts heavy emphasis on standardize tests which prize